I plan to add more test logs, and generally clean it up, but for now, here it is. http://scp-sandbox-3.wikidot.com/derps3 Please feel free to criticize and comment on this, i need all the help i can get.

Right now this is an anomalous item. I don't care about this dice, there's no story (for example an origin story or a recovery log) to keep me invested, it's just a magic d20. The magic items section of the common pitfalls list explains it better than I can, essentially there's no context here to make this interesting. If you want to expand your concept more try the ideas and brainstorming forum.